delete hardcoded mempools & configurable mempool id

[0xSulpiride]

Description

• deleted all hardcoded mempool ids
• mempool id can be set in config.json using these 2 params: canonicalMempoolId and canonicalMempoolEntryPoint

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
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Further comments (optional)

[ch4r10t33r]

I wondering if we should also add a constants/defaults for EP and mempoolId which will be used as a fallback in case these values are not provided in the config file?

[0xSulpiride]

@ch4r10t33r I'm not sure if this is future-proof, because we would have to change or delete fallback values in case of a change to mempool ids so that adds some maintenance burden on us